Youngsters can crawl into the beast’s belly and encounter a shipwrecked pirate with exciting tales to tell.
There will also be a mermaid - all courtesy of London-based circus theatre company Circo Rum Ba Ba.
Dewsbury on Sea, in which the town centre is turned into a beach resort, starts at 10am on Saturday August 24.
There will be a funfair, donkey rides, face painting, henna tattoos and music from Real Radio.
Visitors will be able to purchase an exclusive Dewsbury on Sea t-shirt designed by eight-year-old resident Calum Beck.
The garments, printed by Batley’s A B Print Group, can be bought from a ‘surf shack’ shop throughout the day.
All proceeds from sales will be donated to the global charity the Whale and Dolphin Conservation Society.
Kirklees Council cabinet member for place Coun Cathy Scott (Lab, Dewsbury East) hailed the event.
She said: “I’m excited to see Dewsbury on Sea is back again this year with even more to entertain young and old.
“It always proves to be a summer hit that brings the bringing wonder of the seaside to Dewsbury. Everyone should come down and see what’s going on.”
Activities will continue until about 4pm, and a full schedule can be found online at www.kirklees.gov.uk/dewsburyonsea.